Rotary vane pump with inlet and discharge ports in end sealing plates

Abstract

A rotary pump having a housing with a cylindrical cavity and end heads at each end to form a pump cavity. A drive shaft journaled by bearings carries a rotor having a number of movable vanes. Seal plates at each end of the pump cavity to divide it into a pair of end chambers defined by the seal plates and the end heads. Fluid inlet and discharge ports are provided in the sealing plates. The ports are formed as protrusions in the end plates towards the end chambers, as recesses therein or extending as openings into the end heads.

What is claimed is: 
     
       1. In a rotary fluid pump including a housing having a generally cylindrical cavity extending therethrough, a pair of recessed end heads assembled at opposite ends of the housing to form a pump cavity therewith, a drive shaft journalled in said end heads by bearings and extending into the interior of the pump cavity, a rotor mounted on the drive shaft within the pump cavity, a pair of sealing plates individually disposed between the ends of the housing and the end heads to divide the pump cavity into a pair of end chambers defined by the end heads and the sealing plates and an intermediate rotor chamber defined by the sealing plates and, a plurality of vanes slidingly disposed in grooves radially formed in the rotor, the improvement comprising; said sealing plates being resilient to allow for deformation and extending from said drive shaft radially outward to said housing;   fluid inlet and discharge ports provided in the resilient sealing plates in fluid communication with said pump cavity, and wherein said resilient plates isolate said end chambers to prevent fluid communication between said ports and said end chambers.   
     
     
       2. The improvement of claim 1, wherein said fluid inlet and discharge ports are formed by protruding said resilient sealing plates toward said end chambers to provide concave space having random shapes. 
     
     
       3. The improvement of claims 1 or 2 further comprising fluid intake and discharge openings formed in said housing body, said openings in fluid communication with said rotor chamber through said fluid inlet and outlet ports, respectively. 
     
     
       4. The improvement of claim 1, further comprising a rear bearing support hole formed in the rear end head formed with at least one notch at an inner peripheral surface thereof to provide air communication between the end chamber and the bearing support hole. 
     
     
       5. The improvement of claim 1 wherein said fluid inlet and discharge ports are formed as recesses on inner faces of said resilient sealing plates. 
     
     
       6. The improvement of claim 5 further comprising fluid intake and discharge openings formed in said housing body and wherein said recesses forming said inlet and outlet ports establish fluid communication between said rotor chamber and said inlet and discharge openings, respectively. 
     
     
       7. The improvement of claims 1 or 2 wherein said fluid inlet and discharge ports are formed as outwardly extending openings extending into said end heads. 
     
     
       8. The improvement of claim 7 wherein said end heads have fluid intake and discharge openings respectively, said inlet and discharge ports coaxial with said openings and connector portions extending into said ports.